1: 89 percent / m-chloroperoxybenzoic acid / CH2Cl2 / 5.33 h / 0 - 20 °C 2: 1.) MeONa, 2.) NH4Cl / 1.) MeOH, 45 deg C, 21 h, 2.) MeOH, 45 deg C, 20 h View Scheme

1: 1.) t-BuOK / 1.) DMSO, 2.) DMSO, 15 h 2: 89 percent / m-chloroperoxybenzoic acid / CH2Cl2 / 5.33 h / 0 - 20 °C 3: 1.) MeONa, 2.) NH4Cl / 1.) MeOH, 45 deg C, 21 h, 2.) MeOH, 45 deg C, 20 h View Scheme

sodium methylate; ammonium chloride 1.) MeOH, 45 deg C, 21 h, 2.) MeOH, 45 deg C, 20 h; Yield given. Multistep reaction;